1/* 2 * Implementation independent bits of the Floppy driver. 3 * 4 * much of this file is derived from what was originally the Q40 floppy driver. 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 1999, 2000, 2001 11 * 12 * Sun3x support added 2/4/2000 Sam Creasey (sammy@oh.verio.com) 13 * 14 */ 15 16#include <asm/io.h> 17 18#include <linux/vmalloc.h> 19 20asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs); 21 22/* constants... */ 23 24#undef MAX_DMA_ADDRESS 25#define MAX_DMA_ADDRESS 0x00 /* nothing like that */ 26 27 28/* 29 * Again, the CMOS information doesn't work on m68k.. 30 */ 31#define FLOPPY0_TYPE (MACH_IS_Q40 ? 6 : 4) 32#define FLOPPY1_TYPE 0 33 34#define FLOPPY_MOTOR_MASK 0xf0 35 36 37/* basically PC init + set use_virtual_dma */ 38#define FDC1 m68k_floppy_init() 39 40#define N_FDC 1 41#define N_DRIVE 8 42 43 44/* vdma globals adapted from asm-i386/floppy.h */ 45 46static int virtual_dma_count=0; 47static int virtual_dma_residue=0; 48static char *virtual_dma_addr=0; 49static int virtual_dma_mode=0; 50static int doing_pdma=0; 51 52#include <asm/sun3xflop.h> 53 54extern spinlock_t dma_spin_lock; 55 56static __inline__ unsigned long claim_dma_lock(void) 57{ 58 unsigned long flags; 59 spin_lock_irqsave(&dma_spin_lock, flags); 60 return flags; 61} 62 63static __inline__ void release_dma_lock(unsigned long flags) 64{ 65 spin_unlock_irqrestore(&dma_spin_lock, flags); 66} 67 68 69static __inline__ unsigned char fd_inb(int port) 70{ 71 if(MACH_IS_Q40) 72 return inb_p(port); 73 else if(MACH_IS_SUN3X) 74 return sun3x_82072_fd_inb(port); 75} 76 77static __inline__ void fd_outb(unsigned char value, int port) 78{ 79 if(MACH_IS_Q40) 80 outb_p(value, port); 81 else if(MACH_IS_SUN3X) 82 sun3x_82072_fd_outb(value, port); 83} 84 85 86static int fd_request_irq(void) 87{ 88 if(MACH_IS_Q40) 89 return request_irq(FLOPPY_IRQ, floppy_hardint,SA_INTERRUPT, 90 "floppy", floppy_hardint); 91 else if(MACH_IS_SUN3X) 92 return sun3xflop_request_irq(); 93 94} 95 96static void fd_free_irq(void) 97{ 98 if(MACH_IS_Q40) 99 free_irq(FLOPPY_IRQ, floppy_hardint); 100} 101 102#define fd_request_dma() vdma_request_dma(FLOPPY_DMA,"floppy") 103#define fd_get_dma_residue() vdma_get_dma_residue(FLOPPY_DMA) 104#define fd_dma_mem_alloc(size) vdma_mem_alloc(size) 105#define fd_dma_setup(addr, size, mode, io) vdma_dma_setup(addr, size, mode, io) 106 107#define fd_enable_irq() /* nothing... */ 108#define fd_disable_irq() /* nothing... */ 109 110#define fd_free_dma() /* nothing */ 111 112/* No 64k boundary crossing problems on Q40 - no DMA at all */ 113#define CROSS_64KB(a,s) (0) 114 115#define DMA_MODE_READ 0x44 /* i386 look-alike */ 116#define DMA_MODE_WRITE 0x48 117 118 119static int m68k_floppy_init(void) 120{ 121 use_virtual_dma =1; 122 can_use_virtual_dma = 1; 123 124 125 if (MACH_IS_Q40) 126 return 0x3f0; 127 else if(MACH_IS_SUN3X) 128 return sun3xflop_init(); 129 else 130 return -1; 131} 132 133 134static int vdma_request_dma(unsigned int dmanr, const char * device_id) 135{ 136 return 0; 137} 138 139 140static int vdma_get_dma_residue(unsigned int dummy) 141{ 142 return virtual_dma_count + virtual_dma_residue; 143} 144 145 146static unsigned long vdma_mem_alloc(unsigned long size) 147{ 148 return (unsigned long) vmalloc(size); 149 150} 151 152static void _fd_dma_mem_free(unsigned long addr, unsigned long size) 153{ 154 vfree((void *)addr); 155} 156#define fd_dma_mem_free(addr,size) _fd_dma_mem_free(addr, size) 157 158 159/* choose_dma_mode ???*/ 160 161static int vdma_dma_setup(char *addr, unsigned long size, int mode, int io) 162{ 163 doing_pdma = 1; 164 virtual_dma_port = (MACH_IS_Q40 ? io : 0); 165 virtual_dma_mode = (mode == DMA_MODE_WRITE); 166 virtual_dma_addr = addr; 167 virtual_dma_count = size; 168 virtual_dma_residue = 0; 169 return 0; 170} 171 172 173 174static void fd_disable_dma(void) 175{ 176 doing_pdma = 0; 177 virtual_dma_residue += virtual_dma_count; 178 virtual_dma_count=0; 179} 180 181 182 183/* this is the only truly Q40 specific function */ 184 185asmlinkage void floppy_hardint(int irq, void *dev_id, struct pt_regs * regs) 186{ 187 register unsigned char st; 188 189#undef TRACE_FLPY_INT 190#define NO_FLOPPY_ASSEMBLER 191 192#ifdef TRACE_FLPY_INT 193 static int calls=0; 194 static int bytes=0; 195 static int dma_wait=0; 196#endif 197 if(!doing_pdma) { 198 floppy_interrupt(irq, dev_id, regs); 199 return; 200 } 201 202#ifdef TRACE_FLPY_INT 203 if(!calls) 204 bytes = virtual_dma_count; 205#endif 206 207 { 208 register int lcount; 209 register char *lptr; 210 211 /* serve 1st byte fast: */ 212 213 st=1; 214 for(lcount=virtual_dma_count, lptr=virtual_dma_addr; 215 lcount; lcount--, lptr++) { 216 st=inb(virtual_dma_port+4) & 0xa0 ; 217 if(st != 0xa0) 218 break; 219 if(virtual_dma_mode) 220 outb_p(*lptr, virtual_dma_port+5); 221 else 222 *lptr = inb_p(virtual_dma_port+5); 223 } 224 225 virtual_dma_count = lcount; 226 virtual_dma_addr = lptr; 227 st = inb(virtual_dma_port+4); 228 } 229 230#ifdef TRACE_FLPY_INT 231 calls++; 232#endif 233 if(st == 0x20) 234 return; 235 if(!(st & 0x20)) { 236 virtual_dma_residue += virtual_dma_count; 237 virtual_dma_count=0; 238#ifdef TRACE_FLPY_INT 239 printk("count=%x, residue=%x calls=%d bytes=%d dma_wait=%d\n", 240 virtual_dma_count, virtual_dma_residue, calls, bytes, 241 dma_wait); 242 calls = 0; 243 dma_wait=0; 244#endif 245 doing_pdma = 0; 246 floppy_interrupt(irq, dev_id, regs); 247 return; 248 } 249#ifdef TRACE_FLPY_INT 250 if(!virtual_dma_count) 251 dma_wait++; 252#endif 253} 254 255#define EXTRA_FLOPPY_PARAMS 256